support go1.21 and set min version to go1.19

.github/workflows/gin.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Setup go
         uses: actions/setup-go@v4
         with:
-          go-version: '^1.18'
+          go-version: '^1.19'
       - name: Checkout repository
         uses: actions/checkout@v3
       - name: Setup golangci-lint
@@ -31,7 +31,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        go: ['1.18', '1.19', '1.20']
+        go: ['1.19', '1.20', '1.21']
         test-tags: ['', '-tags nomsgpack', '-tags "sonic avx"', '-tags go_json']
         include:
           - os: ubuntu-latest
@@ -73,5 +73,5 @@ jobs:
           flags: ${{ matrix.os }},go-${{ matrix.go }},${{ matrix.test-tags }}
 
       - name: Format
-        if: matrix.go-version == '1.20.x'
+        if: matrix.go-version == '1.21.x'
         run: diff -u <(echo -n) <(gofmt -d .)

.github/workflows/goreleaser.yml

@@ -21,7 +21,7 @@ jobs:
         name: Set up Go
         uses: actions/setup-go@v4
         with:
-          go-version: 1.20
+          go-version: 1.21
       -
         name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v4

context_1.18_test.go

@@ -1,37 +0,0 @@
-// Copyright 2021 Gin Core Team. All rights reserved.
-// Use of this source code is governed by a MIT style
-// license that can be found in the LICENSE file.
-
-//go:build !go1.19
-
-package gin
-
-import (
-	"bytes"
-	"mime/multipart"
-	"net/http"
-	"net/http/httptest"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestContextFormFileFailed18(t *testing.T) {
-	buf := new(bytes.Buffer)
-	mw := multipart.NewWriter(buf)
-	defer func(mw *multipart.Writer) {
-		err := mw.Close()
-		if err != nil {
-			assert.Error(t, err)
-		}
-	}(mw)
-	c, _ := CreateTestContext(httptest.NewRecorder())
-	c.Request, _ = http.NewRequest("POST", "/", nil)
-	c.Request.Header.Set("Content-Type", mw.FormDataContentType())
-	c.engine.MaxMultipartMemory = 8 << 20
-	assert.Panics(t, func() {
-		f, err := c.FormFile("file")
-		assert.Error(t, err)
-		assert.Nil(t, f)
-	})
-}

context_1.19_test.go

@@ -1,30 +0,0 @@
-// Copyright 2022 Gin Core Team. All rights reserved.
-// Use of this source code is governed by a MIT style
-// license that can be found in the LICENSE file.
-
-//go:build go1.19
-
-package gin
-
-import (
-	"bytes"
-	"mime/multipart"
-	"net/http"
-	"net/http/httptest"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestContextFormFileFailed19(t *testing.T) {
-	buf := new(bytes.Buffer)
-	mw := multipart.NewWriter(buf)
-	mw.Close()
-	c, _ := CreateTestContext(httptest.NewRecorder())
-	c.Request, _ = http.NewRequest("POST", "/", nil)
-	c.Request.Header.Set("Content-Type", mw.FormDataContentType())
-	c.engine.MaxMultipartMemory = 8 << 20
-	f, err := c.FormFile("file")
-	assert.Error(t, err)
-	assert.Nil(t, f)
-}

context_test.go

@@ -90,6 +90,19 @@ func TestContextFormFile(t *testing.T) {
 	assert.NoError(t, c.SaveUploadedFile(f, "test"))
 }
 
+func TestContextFormFileFailed(t *testing.T) {
+	buf := new(bytes.Buffer)
+	mw := multipart.NewWriter(buf)
+	mw.Close()
+	c, _ := CreateTestContext(httptest.NewRecorder())
+	c.Request, _ = http.NewRequest("POST", "/", nil)
+	c.Request.Header.Set("Content-Type", mw.FormDataContentType())
+	c.engine.MaxMultipartMemory = 8 << 20
+	f, err := c.FormFile("file")
+	assert.Error(t, err)
+	assert.Nil(t, f)
+}
+
 func TestContextMultipartForm(t *testing.T) {
 	buf := new(bytes.Buffer)
 	mw := multipart.NewWriter(buf)

debug.go

@@ -67,7 +67,7 @@ func getMinVer(v string) (uint64, error) {
 
 func debugPrintWARNINGDefault() {
 	if v, e := getMinVer(runtime.Version()); e == nil && v < ginSupportMinGoVer {
-		debugPrint(`[WARNING] Now Gin requires Go 1.18+.
+		debugPrint(`[WARNING] Now Gin requires Go 1.19+.
 
 `)
 	}

debug_test.go

@@ -104,7 +104,7 @@ func TestDebugPrintWARNINGDefault(t *testing.T) {
 	})
 	m, e := getMinVer(runtime.Version())
 	if e == nil && m < ginSupportMinGoVer {
-		assert.Equal(t, "[GIN-debug] [WARNING] Now Gin requires Go 1.18+.\n\n[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
+		assert.Equal(t, "[GIN-debug] [WARNING] Now Gin requires Go 1.19+.\n\n[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
 	} else {
 		assert.Equal(t, "[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
 	}

internal/bytesconv/bytesconv.go

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a MIT style
 // license that can be found in the LICENSE file.
 
-//go:build go1.20
-
 package bytesconv
 
 import (